I have MC18 set up on my HTPC which by default does not have a keyboard or mouse attached only a remote. I also have it set up on my Slate PC (which has no attached keyboard) for use on plane trips. I fail to see why needing a keyboard and mouse is a solution.
I assume that you have a button on your remote mapped to the "Green Button" function in MC, as it is a pretty essential button for navigating efficiently in Theater View. It cycles through Theater View Most Recent > Theater View Home > Display View (if Playing). If you need to map it on a remote, you can do it using
MCC_THEATER_VIEW - 22001 (which you can execute using mc18.exe /MCC 22001,0 at the command line). F11 does mostly the same thing, but adds in Standard View. You can decide which you'd like to use if you're mapping them yourself. If you are using a Windows Media Center remote, it will automatically map this function to the Green Button (hence us calling it the green button).
Jim didn't intend for you to interpret his suggestion as a "solution", though, but as a workaround. As others have mentioned, this is reasonably rare (I, too, have never seen it on multiple machines). But rest assured that if Jim is seeing it, and it is possible for them to fix it (it isn't a GPU driver bug they can't fix), then it is on their list to be fixed.
I assume that your devices are using Intel integrated GPUs. I'd recommend trying to update your graphics drivers, as they're the most likely culprit:
http://www.intel.com/p/en_US/support/detect/graphics